HRDLifKA] STONE INDUSTRIES OF THE ARGENTINE COAST 123 



ward the coast is more precipitous and the beach is less accessible 

 from the plain. 



This relation between the local slope to the beach and the industry 

 which was carried on in the immediate vicinity leaves no doubt in the 

 mind of the writer that the industry is even more recent than the 

 beach. It has already been stated that the coast is very young. 

 It is developing, changing rapidly. Its actual features are forming 

 now and endure but a short time. The industry is younger still. 

 Several instances were observed of a precise relation between anvil- 

 stones, and the immediate surface, which could liardly endure a cen- 

 tury on this slope under tlie activities of wind erosion tliat now exist. 

 There were also other evidences of a relatively recent occupancy of 

 the place (see pis. 9-11). The writer does not think a century has 

 passed since the stones referred to were used. 



Notes on Punta Porvenir 



. By Bailey Willis 



Punta Porvenir is a low point jutting into the Atlantic just south 

 of Cabo Corrientes and forming part of the extreme eastern projec- 

 tion of the coast of Buenos Aires. The interest which attaches to the 

 locality rests in the discovery of worked and unworked stones, which 

 the writer has not seen, by Doctor Ameghino and liis brother Carlos, in 

 association with the carapace of a glyptodon on the point near the sea. 

 Doctor Ameghino and his brother both accompanied Doctor Hrdhcka 

 and the writer to the place and pointed out the exact spot, where a 

 hollow indicated the partl}^, filled, not very large excavation. A piece 

 of bone from the massive tail of a glyptodon lay on the surface near 

 by. Amegliino stated that they had dug a hole to a depth of about a 

 meter down through the superficial formation to the underlying 

 Pampean terrane. The latter he styles ''Ensenadean" and the former 

 "Inter-Ensenadean," His view is that the superficial formation on 

 the Inter-Ensenadean was deposited during a marine transgression 

 which took place in the Ensenadean epoch. He places that epoch 

 in the Pliocene, a reference wliich the writer regards as probably 

 correct, and deduces thence the PHocene age of the Inter-Ensena- 

 dean and its contained fossils. The writer is obliged to dissent 

 from this deduction since the Inter-Ensenadean is marked as very 

 modern by its intimate relation to the recent coast fine at every 

 point where Doctor Ameghino identified it. This relation has been 

 discussed in connection with the coastal formations, but the occur- 

 rence on Punta Porvenir requires special description because of the 

 delicate and temporary adjustment of conditions leading to its 

 formation. 



